bark louse – English noun declension

Noun: bark louse

Singular	bark louse
Plural	bark lice

Housed plants are considerably injured by an oval bark-louse, the Coccus Hesperidum of Linnæus, which has been introduced from abroad. [1833 January 20, The New England Farmer and Horticultural Journal, volume 11, page 226:]
Another group of insects that tend to be very secretive in their habits and were very well represented in the ancient forest are the bark lice, or psocids.⁶⁸ Bark lice (90) are usually solitary, but sometimes the adults and nymphs live together under webs spun out of silk emitted from head glands. They are found not only in litter but, as their name implies, on and under bark. [1999, George O. Poinar, Roberta Poinar, The Amber Forest: A Reconstruction of a Vanished World, page 84:]
These include springtails (order Collembola), bark lice (order Ps[o]coptera),[…]. [2002, Lance A. Durden, Gary R. Mullen, “1: Introduction”, in Gary R. Mullen, Lance A. Durden, editors, Medical and Veterinary Entomology, page 8:]
When present the wings are membranous, with reduced venation, with the hind wing coupled to the larger fore wing in flight and at rest, when the wings are held roof-like over the abdomen (as shown here for the bark louse Amphigerontia contaminata (Psocidae); after Badonnel 1951). [2010, P. J. Gullan, P. S. Cranston, editors, The Insects: An Outline of Entomology, 4th edition, page 479:]

English noun forms of bark louse